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Gastroenterologists who accept Medicare in Irvine, CA
CMS lists 34 clinicians in this specialty with a practice address in Irvine. Accept Medicare assignment (the Medicare-approved amount as full payment): 34. Offer telehealth: 19.
Typical amounts Medicare approves in ZIP 92618 (2024 Medicare rates, the latest CMS has published): a new-patient visit $142, of which you pay about $36; a follow-up visit $110, of which you pay about $27 — the 20% coinsurance after the yearly Part B deductible. Clinicians who don't accept assignment can charge up to 15% more; with a Medicare Advantage plan, your plan's copay applies instead.
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Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Jim Amerian, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 1980 · New York Medical CollegeMaleDrug and device company payments (2025): $755Ardalan Babaknia, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 1984MaleDrug and device company payments (2025): $628Philip T. Chen, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 2002 · George Washington University School of MedicineMaleDrug and device company payments (2025): $647David Choi, DO
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 2015 · At Still University of Health Sciences, College of Osteo Med, KirksvilleMaleDrug and device company payments (2025): $3,600You-Jen Chou, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 2008 · Boston University School of MedicineMaleOther offices in Irvine: 1Drug and device company payments (2025): $1,371James Lee, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 1990MaleDrug and device company payments (2025): $2,769Paul S. Lee, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 2001 · George Washington University School of MedicineMaleDrug and device company payments (2025): $3,033Roxanne Lim, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 2006FemaleDrug and device company payments (2025): $3,217Gustavo A. Machicado, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 1974 · University of California, San Francisco School of MedicineMaleDrug and device company payments (2025): $536Haig Najarian, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 1992 · Un of California, Irvine, College of MedicineMaleDrug and device company payments (2025): $2,019Matthew J. Oman, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 2007 · University of Utah School of MedicineMaleDrug and device company payments (2025): $3,153Victor Yu
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 2003 · University of Southern California Keck School of MedicineMaleDrug and device company payments (2025): $2,646Omeed Alipour, MD
✓ Accepts Medicare assignmentMIPS score (2024): 93.9/100✓ TelehealthGraduated 2017MaleDrug and device company payments (2025): $694James L. Lin, MD
✓ Accepts Medicare assignmentMIPS score (2024): 92.8/100✓ TelehealthGraduated 2002 · Rutgers R W Johnson Medical School (cam/new Bruns/pisc)MaleDrug and device company payments (2025): $188Lance T. Uradomo, MD
✓ Accepts Medicare assignmentMIPS score (2024): 92.8/100✓ TelehealthGraduated 2000 · George Washington University School of MedicineMaleDrug and device company payments (2025): $328Tse Ling Fong, MD
✓ Accepts Medicare assignmentMIPS score (2024): 87.5/100✓ TelehealthGraduated 1982 · University of Southern California Keck School of MedicineMaleDrug and device company payments (2025): $182Caroline Hwang, MD
✓ Accepts Medicare assignmentMIPS score (2024): 87.5/100✓ TelehealthGraduated 2005 · University of California, Geffen School of MedicineFemaleDrug and device company payments (2025): $88,870Rashmi Kumar, MD
✓ Accepts Medicare assignmentMIPS score (2024): 87.5/100✓ TelehealthGraduated 2007FemaleDrug and device company payments (2025): $37,880David J. Kaufman, DO
✓ Accepts Medicare assignmentMIPS score (2024): 79.4/100✓ TelehealthGraduated 1998MaleDrug and device company payments (2025): $912Herbert H. Lee, MD
✓ Accepts Medicare assignmentMIPS score (2024): 76/100✓ TelehealthGraduated 1980MaleOther offices in Irvine: 2Drug and device company payments (2025): $7,337Kumaravel Perumalsamy, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100✓ TelehealthGraduated 1995MaleDrug and device company payments (2025): $9,066Fang F. Yu, MD
✓ Accepts Medicare assignmentMIPS score (2024): 23.9/100✓ TelehealthGraduated 1982MaleDrug and device company payments (2025): $612Heba Ashraf, MD
✓ Accepts Medicare assignmentGraduated 2011FemaleDrug and device company payments (2025): $2,953Danh Dan, MD
✓ Accepts Medicare assignmentGraduated 2008 · Medical College of WisconsinMaleOther offices in Irvine: 2Seper Dezfoli, MD
✓ Accepts Medicare assignmentGraduated 2009 · Pennsylvania State University College of MedicineMaleDrug and device company payments (2025): $34,305Brian Lee, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2013 · Rush Medical College of Rush UniversityMaleDrug and device company payments (2025): $2,873Patrick Lee, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2019MaleDrug and device company payments (2025): $47Bret N. Namihas, MD
✓ Accepts Medicare assignmentGraduated 1987MaleOther offices in Irvine: 2Drug and device company payments (2025): $180Poneh Rahimi, MD
✓ Accepts Medicare assignmentGraduated 1998FemaleDrug and device company payments (2025): $37Jenny C. Risman, MD
✓ Accepts Medicare assignmentGraduated 2009 · Boston University School of MedicineFemaleOther offices in Irvine: 2Javed N. Sadiq, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2009MaleDrug and device company payments (2025): $1,199Bashar Sharma, MD
✓ Accepts Medicare assignmentGraduated 2013MaleKhoi M. Tran, MD
✓ Accepts Medicare assignmentGraduated 1990 · University of California, Irvine, California College of MedicineMaleDrug and device company payments (2025): $120Jacques Van Dam, MD
✓ Accepts Medicare assignmentGraduated 1984 · Georgetown University School of MedicineMale
Before you book
This list comes from Medicare's enrollment records, not from reviews. Call the office to confirm the clinician is taking new Medicare patients. With Original Medicare, a clinician who accepts assignment can only charge you the Medicare deductible and coinsurance; one who doesn't may charge up to 15% more than the Medicare-approved amount. If you have a Medicare Advantage plan, check that the clinician is in the plan's network.
The MIPS final score (0–100) comes from Medicare's Merit-based Incentive Payment System for 2024. It combines quality measures, cost, improvement activities and use of certified health records, and it sets a payment adjustment. Clinicians who report as a group share the group's score. It is not a patient rating, and many clinicians have no published score.
Payments from drug and medical device companies come from CMS Open Payments (2025 general payments: meals, travel, consulting and speaking fees, gifts and similar), summed for each clinician. Receiving payments is legal and common and does not mean a clinician did anything wrong.
Other specialists in Irvine
- Primary care doctors366
- Nurse practitioners249
- Cardiologists31
- Dermatologists28
- Orthopedic surgeons64
- Neurologists31
- Ophthalmologists35
- Optometrists35
- Podiatrists32
- Urologists30
- Pulmonologists21
- Nephrologists8
- Endocrinologists7
- ENT doctors24
- Oncologists42
- Psychiatrists27
- Psychologists80
- Therapists and counselors199
- Physical therapists189
- Occupational therapists21
- Speech therapists33
- Audiologists7
- Chiropractors31
- Gynecologists46
- General surgeons30
- Vascular surgeons7
- Pain management doctors14
- Physiatrists21
- Allergists16
- Dietitians5
- Neurosurgeons9
- Infectious disease doctors10
Other care in Irvine
Hospitals · Nursing homes · Dialysis centers · Home health agencies · Hospices
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Enrollment, addresses and scores are as reported to CMS and can change. This is not a list of in-network providers for any Medicare Advantage plan, and it is not medical advice. Source: CMS Provider Data Catalog — Doctors and Clinicians National Downloadable File, Clinician MIPS Performance 2024 and Facility Affiliation Data (released Oct 2, 2026).